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Catalytic converters for diesel engines

There are several types of catalytic converter available for diesel engines. The most common is known as a ‘two-way’, or ‘oxidation’, catalytic converter. This type will reduce emissions of carbon monoxide and hydrocarbons, including a group of chemicals known as aldehydes, which are responsible for the characteristic diesel smell.

As with all catalytic converters, the diesel oxidation variety only works when the exhaust gas temperature reaches a critical threshold – typically 225C. This means they are best located as close to the exhaust manifold as possible; thermal insulation may also be recommended in some cases.

Because exhaust temperature is so important, datalogging is also sometimes advised before deciding whether fitting a catalytic converter is appropriate and on the specification necessary. BISAF can install a datalogger for this purpose.

Every BISAF catalytic converter can be designed as a separate item, for installation upstream of the standard silencer, or as a combined catalytic converter and silencer. The latter option is invaluable where space is limited, such as on mini-excavators.

Diesel catalytic converters are maintenance-free and do not require any sensors, or other electronics. They do, however, need fuel containing very low levels of sulphur. That said, even the ‘red’ diesel supplied in Britain nowadays meets the requirements in this respect.

No fuel additives are required, either, but the use of lubricating oil compatible with catalytic converters is recommended.

Diesel oxidation converters

Diesel oxidation catalytic converters are maintenance free and do not require any sensors or other electronics.

They do need fuel containing very low levels of sulphur, however even the ‘red’ diesel supplied in Britain these days meets the requirements in this respect.

No fuel additives are required either but it is recommended to use lubricating oil which is compatible with catalytic converters.

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